injection-js
Version:
Dependency Injection library for JavaScript and TypeScript
213 lines (212 loc) • 6.84 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { wrappedError } from './facade/errors';
import { ERROR_ORIGINAL_ERROR, getOriginalError } from './facade/errors';
import { stringify } from './facade/lang';
function findFirstClosedCycle(keys) {
const res = [];
for (let i = 0; i < keys.length; ++i) {
if (res.indexOf(keys[i]) > -1) {
res.push(keys[i]);
return res;
}
res.push(keys[i]);
}
return res;
}
function constructResolvingPath(keys) {
if (keys.length > 1) {
const reversed = findFirstClosedCycle(keys.slice().reverse());
const tokenStrs = reversed.map((k) => stringify(k.token));
return ' (' + tokenStrs.join(' -> ') + ')';
}
return '';
}
function injectionError(injector, key, constructResolvingMessage, originalError) {
const error = (originalError ? wrappedError('', originalError) : Error());
error.addKey = addKey;
error.keys = [key];
error.injectors = [injector];
error.constructResolvingMessage = constructResolvingMessage;
error.message = error.constructResolvingMessage();
error[ERROR_ORIGINAL_ERROR] = originalError;
return error;
}
function addKey(injector, key) {
this.injectors.push(injector);
this.keys.push(key);
this.message = this.constructResolvingMessage();
}
/**
* Thrown when trying to retrieve a dependency by key from {@link Injector}, but the
* {@link Injector} does not have a {@link Provider} for the given key.
*
* ### Example ([live demo](http://plnkr.co/edit/vq8D3FRB9aGbnWJqtEPE?p=preview))
*
* ```typescript
* class A {
* constructor(b:B) {}
* }
*
* expect(() => Injector.resolveAndCreate([A])).toThrowError();
* ```
*/
export function noProviderError(injector, key) {
return injectionError(injector, key, function () {
const first = stringify(this.keys[0].token);
return `No provider for ${first}!${constructResolvingPath(this.keys)}`;
});
}
/**
* Thrown when dependencies form a cycle.
*
* ### Example ([live demo](http://plnkr.co/edit/wYQdNos0Tzql3ei1EV9j?p=info))
*
* ```typescript
* var injector = Injector.resolveAndCreate([
* {provide: "one", useFactory: (two) => "two", deps: [[new Inject("two")]]},
* {provide: "two", useFactory: (one) => "one", deps: [[new Inject("one")]]}
* ]);
*
* expect(() => injector.get("one")).toThrowError();
* ```
*
* Retrieving `A` or `B` throws a `CyclicDependencyError` as the graph above cannot be constructed.
*/
export function cyclicDependencyError(injector, key) {
return injectionError(injector, key, function () {
return `Cannot instantiate cyclic dependency!${constructResolvingPath(this.keys)}`;
});
}
/**
* Thrown when a constructing type returns with an Error.
*
* The `InstantiationError` class contains the original error plus the dependency graph which caused
* this object to be instantiated.
*
* ### Example ([live demo](http://plnkr.co/edit/7aWYdcqTQsP0eNqEdUAf?p=preview))
*
* ```typescript
* class A {
* constructor() {
* throw new Error('message');
* }
* }
*
* var injector = Injector.resolveAndCreate([A]);
* try {
* injector.get(A);
* } catch (e) {
* expect(e instanceof InstantiationError).toBe(true);
* expect(e.originalException.message).toEqual("message");
* expect(e.originalStack).toBeDefined();
* }
* ```
*/
export function instantiationError(injector, originalException, originalStack, key) {
return injectionError(injector, key, function () {
const first = stringify(this.keys[0].token);
return `${getOriginalError(this).message}: Error during instantiation of ${first}!${constructResolvingPath(this.keys)}.`;
}, originalException);
}
/**
* Thrown when an object other then {@link Provider} (or `Type`) is passed to {@link Injector}
* creation.
*
* ### Example ([live demo](http://plnkr.co/edit/YatCFbPAMCL0JSSQ4mvH?p=preview))
*
* ```typescript
* expect(() => Injector.resolveAndCreate(["not a type"])).toThrowError();
* ```
*/
export function invalidProviderError(provider) {
return Error(`Invalid provider - only instances of Provider and Type are allowed, got: ${provider}`);
}
/**
* Thrown when the class has no annotation information.
*
* Lack of annotation information prevents the {@link Injector} from determining which dependencies
* need to be injected into the constructor.
*
* ### Example ([live demo](http://plnkr.co/edit/rHnZtlNS7vJOPQ6pcVkm?p=preview))
*
* ```typescript
* class A {
* constructor(b) {}
* }
*
* expect(() => Injector.resolveAndCreate([A])).toThrowError();
* ```
*
* This error is also thrown when the class not marked with {@link Injectable} has parameter types.
*
* ```typescript
* class B {}
*
* class A {
* constructor(b:B) {} // no information about the parameter types of A is available at runtime.
* }
*
* expect(() => Injector.resolveAndCreate([A,B])).toThrowError();
* ```
* @stable
*/
export function noAnnotationError(typeOrFunc, params) {
const signature = [];
for (let i = 0, ii = params.length; i < ii; i++) {
const parameter = params[i];
if (!parameter || parameter.length === 0) {
signature.push('?');
}
else {
signature.push(parameter.map(stringify).join(' '));
}
}
return Error("Cannot resolve all parameters for '" +
stringify(typeOrFunc) +
"'(" +
signature.join(', ') +
'). ' +
"Make sure that all the parameters are decorated with Inject or have valid type annotations and that '" +
stringify(typeOrFunc) +
"' is decorated with Injectable.");
}
/**
* Thrown when getting an object by index.
*
* ### Example ([live demo](http://plnkr.co/edit/bRs0SX2OTQiJzqvjgl8P?p=preview))
*
* ```typescript
* class A {}
*
* var injector = Injector.resolveAndCreate([A]);
*
* expect(() => injector.getAt(100)).toThrowError();
* ```
* @stable
*/
export function outOfBoundsError(index) {
return Error(`Index ${index} is out-of-bounds.`);
}
// TODO: add a working example after alpha38 is released
/**
* Thrown when a multi provider and a regular provider are bound to the same token.
*
* ### Example
*
* ```typescript
* expect(() => Injector.resolveAndCreate([
* { provide: "Strings", useValue: "string1", multi: true},
* { provide: "Strings", useValue: "string2", multi: false}
* ])).toThrowError();
* ```
*/
export function mixingMultiProvidersWithRegularProvidersError(provider1, provider2) {
return Error(`Cannot mix multi providers and regular providers, got: ${provider1} ${provider2}`);
}
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